domekit 2V

by EFFALO, published

domekit 2V by EFFALO May 25, 2010

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this is a connector design for assembling a 2V geodesic dome structure. based off the wizardry of c60's original Dome Connector, we've improved the design by shaping the hexagonal connectors like hexagons, and the pentagonal ones like pentagons — making it much easier to visually differentiate between the two different connector types. additionally, we've added pairing notches above the 16° B-length struts on both connector shapes, to help accelerate assembly.


to make a dome, you'll need 26 connectors (20 hexagons and 6 pentagons) and 65 struts (35 of length A and 30 of length B).

to make a sphere, you'll need only six more pentagons (for a total of 32 connectors) and 60 each of strut lengths A and B.

this design uses 10mm holes that fit 3/8" hardwood dowels quite nicely, but feel free to adjust the script to your liking. to determine your strut lengths, use a calculator:


and refer to this diagram for assembly:


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PVC 1/2" pipe inside diameter is 0.609" so I guess .84" outside diameter.... America the beautiful

please make half inch version. Could I scale up the print proportionally to get half inch without messing up my dome.

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How about just change the dimention of the design for a strutradius of 10 mm ? thanks

Although having some drawbacks, a good source of very strong struts is the shafts from discarded golf clubs. Check out your local goodwill / second hand shops, where you can find these at very low prices. Modern clubs are usually made of carbon fiber composites and are very light and very rigid.

The drawbacks, of course, are that the shafts are typically tapered and so you won't have a "standard" sized end.

Any suggestions for building? Rod suggestions/sources?

Covering suggestions for temp and perm structures?

Strong enough for thin plywood?

although the struts can be of any length, this connector design works best on small domes, which can be very light and strong. we've been using dowels, but it's not the best all weather solution, obviously. tent poles are another possibility, if you can source enough of them.

some of this is documented here: http://spaceframe.tumblr.comhttp://spaceframe.tumblr.com

I'm watching my Cupcake print it's first pentagon, and like three layers in it started doing what I thought was the nozzle running into a blob. Turns out it was only making the turns for the holes. Silly me!

I printed a single hex on the RapMan-dual head. PLA as raft, ABS as material. 235 for the PLA (to fuse hard to the surface) and 250 for the ABS (to fuse hard to the PLA) 50% fill density, 3 shells over 4 layers. Came out with no warp.

However - trying the multiple command in Skeinforge was not as successful. For some reason - multiples at the same settings warp like crazy. I will post when I get a multiple run.

awesome, thanks for sharing the details.

I think you mean the holes are 10mm (3/8") not 5mm. :)

yes! of course, diameter = radius * 2! will update the description... thanks!

I'm not really gonna be able to print that effectively what with the overhangs. Maybe make it in two parts so I have to print only stuff that doesn't overhang? Cool idea though.


the holes are teardrops and actually print quite nicely on a makerbot! i haven't run into any overhang issues.

Oops! My mistake, I'll have to look more closely next time.

This is nice node design. You might also want to look into the Universal Node System geometry proposed by Peter Pearce. This is an alternative to the Fuller geometry based on a rhombicuboctahedron node. It was developed as the basis of the building system Min-A-Max which later became used in the Biosphere II. It's interesting in its ability to support enclosure frames like the geodesic, planar/deck trusses, trusses, and space-filling space frames all with the same node geometry. Min-A-Max developed into a rather elaborate system but the core UNS was capable of some novel flowing building forms that went beyond the dome.


These are from the book Structure In Nature Is A Strategy For Design. I've often wondered why more people don't experiment wit
h this, though it may be that it's just not well known.

Greta work and great links, thanks!!!

wow, awesome, thanks... i was completely unaware of this system, thanks for pointing it out!